TPC also provides lots of databases, queries and benchmarks for all different types of applications of databases:<p><a href="http://www.tpc.org/default.asp" rel="nofollow">http://www.tpc.org/default.asp</a>
a tip: I couldn't find the license in the first page. It would be helpful to see it in first place.<p>If the license isn't useful, it doesn't matter too much how it is organized and which data it contains.<p>BTW, it is very useful in classes.